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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cb18caa18c9351670739bb35f1b7144145fceba32f2d105458061749f8d70d' 
  AND token = 'IWT7KKPL6DQDOJxeS3BaItB2YgbeKrlyrnFu/c3vJoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}